Transfer sheet



E. STRAUSS TRANSFER SHEET June 14, 1966 2 Sheets-Sheet 1 Filed Sept. l1'. 1964 INVEN'OR. E UG 4/ 5 'FFH an June 14, 1966 E. sTRAUss 3,256,108

TRANSFER SHEET Filed Sept. 1l) 1964 2 Sheets-Sheet 2 F/G. 4a Y F/G. 4a

lz 2 f6 INVENTOR. EUGN JTR aus.:

United States Patent O 3,256,108 TRANSFER SHEET Eugen Strauss, Milan, Italy, assignor to Kores Manufacturing Corporation, New York, N.Y. Filed Sept. 11, 1964, Ser. No. 395,947 Claims priority, application Italy, Dec. 23, 1960, 641,897; July 8, 1961, 695,786; Great Britain, Sept. 18, 19163, 36,820/ 63 The portion of the term of the patent subsequent to Feb. 16, 1982, has been disclaimed 8 Claims. (Cl. 117-363) The present application is a continuation-in-part of my copending application Serial 208,529, filed April 9, 1962,

1 entitled Copy Paper, and now U.S. Letters Patent 3,169,880. Application Serial No. 208,529 in turn is a continuation-in-part of application Serial No. 136,711, filed September 5, 1961, entitled Copy Paper or the Like, and now abandoned.

The present invention relates to a copy paper or the like and, more particularly, to a paper which may be used for making a plurality of copies Without use between the sheets of paper of the well known carbon paper.

The present invention is an improvement over the invention disclosed and claimed in my copending application SerialNo. 208,529, now Patent No. 3,169,880.

Patented June' 14, 19266 ICC group consisting of bentonite, kaolin, calcium carbonate, calcium sulfate, calcium phosphate, and Zinc oxide, and of a pigment, and provided on the other face thereof with a take-up layer sensitive to and adapted to receive impressions of said transfer layer, said take-up layer consisting essentially of a dried resinous substance selected from the group consisting of vinyl polymers, ethyl cellu- Copy papers of the type with which the present invention is concerned have a colored transfer layer which is applied to the rear face of a carrier sheet, the front face of the sheet having thereon a take-up layer adapted to accept the colored transfer layer. By superposing the rear face of one such sheet on the front face of another such sheet and Writing on the front face of said one sheet, a copy of the Writing is obtained on the front face of the underlying sheet.

In my copending application Serial No. 208,529, the contents of which are incorporated herein by reference,

there is disclosed a copy paper having on one face thereof a transfer layer essentially comprising a natural or synthetic resin or resinous substance which acts as a binding agent, at least one plasticizer for the resinous substance, at least one organic fixing agent, at least one finely divided, colloidal substance serving as a filler material and preferably a coloring pigment. The transfer layer has a microscopically discrete character whereby under substantial local pressure applied to the other face of the copy paper the transfer layer will transfer locally to a take-up layer essentially comprising a natural or synthetic resin and at least one plasticizer therefor. The organic fixing agent of the transfer layer assists in providing the same with its microscopically discrete character.

Thus, the copy paper or the like disclosed in my copending application Serial No. 208,529, may comprise a carrier sheet provided on one face thereof with a transfer layer consisting essentially of a resinous substance selected from the group consisting of polyvinyl acetate, mixed polymerisates of polyvinyl acetate, colophonium, polymethylacrylate, polymethylmethacrylate, polycarbonates, polystyrene, polychloroprene, styrene-butadiene copolymers, synthetic cellulose resins, cumarone resin and cumarone-phenol resins, of an effective amount of at least one plasticizer for the resinous substance, of at least one organic fixing agent in an amount of between about 15- 90% of the Weight of the resinous substance and selected from the group consisting of tannic acid, phthalic acid, gallic acid, digallic acid, salicyclic acid, phenyl salicylate, 4-butylphenyl-salicylate, 5-chloro 2 hydroxy-benzophenone, 2,4-dibenzoyl-resorcin, phenol and pyrogallic acid, of a-t least one inorganic colloidal substance in an amount of 1.15-1.70 times the weight of the resinous substance plus said plasticizer and selected from the lose, benzyl cellulose, methyl cellulose, carboxymethyl cellulose, polydioleiin'es, diolefine-styrene mixed polymers, polycarbonates, colophonium, copal, abietic-maleic resins and cumarone resins,'and of an effective amount of at least one plasticizer in which said resinous substance is soluble, whereby said transfer layer of -the type described is adapted to transfer impressions thereto.

It is an object of the present invention to provide a copy sheet with a transfer layer thereon which will serve the same purpose as the transfer layer disclosed in my copending application Serial No. 208,529, which, however, does not require the incorporation therein of the resinous substance, described above.

Other objects and advantages of the present invention will become apparent from a further reading of the description and of the appended claims.

With the above and other objects in view, the present invention contemplates a copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of an effective amount of at least one plasticizer for the tannic acid, of at least one solid inorganic colloidal filler material in `an amount of L15-1.70 times the weight of the tannic acid plus the plasticizer, whereby upon the making of an impression on the opposite face of the carrier sheet when the one face thereof is in contact with a face of a take-up sheet sensitive to and adapted to receive the transfer layer a portion of the transfer layer corresponding to the impression is transferred to and adheres to the take-up sheet, thereby making a copy of the impression thereon.

It has been found, according to the present invention, that if tannic acid is used as the organic fixing agent in the transfer layer of copy papers of the type described in my copending application Serial No. 208,529, then the use of the resinous substance or natural or synthetic resin binding agent may be dispensed with, so that the transfer layer of the present invention will essentially comprise tannic acid which will serve in place of the resinous substance and of the organic fixing agent, a nonvolatile plasticizer for tannicjacid, at least one finelydivided, preferably colloidal inorganic filler material, preferably a coloring material such as a coloring pigment and, if desired, in addition a secondary plasticizer which softens the transfer layer without having a dissolving effect on the tannic acid.

The tannic acid may be present in the transfer layer, for instance in an amount equal to between l0 and 30%. of the Weight of the transfer layer and very good results are achieved with an amount of tannic 4acid equal to about 15% of the weight of the transfer layer.

The plasticizers, inorganic filler materials or colloidal substances and coloring materials which may be employed in the transfer layer of the present invention may be the same as those described in application Serial No. 208,529. The softening material or secondary plasticizer which is advantageously used in the transfer layer, may be, for example, castor oil or ricinoleic acid.

lf it is desired to use the copy paper of the present invention in paper processing machines having magnetic or electric sensing heads, the copy paper may be adapted for such use by incorporating in the transfer layer a magnetic material, such as for example, magnetic iron oxide powder. The term magnetic material as used in the present specification and claims is also-to encompass magnetizable materials, such as for instance, iron powder. Such magnetic materials may fully or in part replace the inorganic colloidal substance or filler material.

As primary plasticizer for the tannic acid, preferably such are used which are non-volatile and capable of dissolving tannic acid, for instance, dibutylphthalate, dioctylphthalate, diamylphthalate, tricresylphosphate, cyclohexyl-p-toluenesulfonamide, dioctylsebacate, dibutyl-stearate, tributylphosphate, and the like. These primary plasticizers are preferably incorporated in the transfer layer in an amount equal to between 0.5 and 3 times the weight of the tannic acid and most preferably in an amount lof between 0.8 and 1.3 times the weight of the tannic acid.

It is frequently desirable to incorporate, in addition to the primary plasticizer, also a secondary plasticizer or softener which will make the transfer layer softer without having a dissolving effect on the tannic acid. For this purpose, castor oil and ricinoleic acid have given good results. The secondary plasticizer or softening agent is also applied preferably in an amount equal to between 0.5 and 3 times the weight of the tannic acid, and most preferably in an amount equal to between about 0.8 and 1.3 times the weight of the tannic acid.

As non-magnetic inorganic colloidal ller materials good results are achieved with bentonite, kaolin, calcium carbonate, calcium sulfate, calcium phosphate and zinc oxide. These inorganic colloidal ller materials are preferably used in an amount equal to between 1.15 and 1.70 times the combined weight of the tannic acid plus the plasticizer, and preferably in an amount equal to between 1.215 and 1.40 times the weight of the tannic acid plus plasticizer.

The non-magnetic colloidal filler materials may be replaced fully or in part with magnetic or magnetizable colloidal filler materials, such as magnetite (Fe304) gamma- Fe203 with and without an addition of cobalt or iron powder. Commercially available magnetic pigments such as LK (BASF) or Magnet pigment S-l2 (BAYER) have also given good results.

In the case that the inorganic cololidal filler material is a magnetic or magnetizable material, a certain coloring of the transfer layer is achieved by the incorporation of such magnetic or magnetizable materials. Generally, the coloring power of the magnetic or magnetizable material is too weak so that in addition thereto, like in the case of non-magnetic inorganic colloidal flller materials, a coloring pigment is to be added to the transfer layer. Particularly when gamma-Fe203 is used as the magnetic material, the brown color thereof will be too weak and the additional use of color pigments is required.

Thus, color pigments are not essential in order to achieve proper transfer but they are important in order to have a sufficiently contrasting color in the transferred portions of the transfer layer. Preferably, between 2.5 and 29% of the transfer layer will be constituted by the coloring pigment, in the case of carbon black as the pigment very` good results are obtained by incorporating 12% by weight thereof in the transfer layer. When black magnetic colloidal materials are used as the inorganic filler material, then the amount of additional coloring pigment such as carbon black may be reduced to between about 2 and 20% by weight of the transfer layer, in the case of carbon black, preferably to about 8%.

The inorganic filler may be present in the transfer layer, for instance, in an amount equal to between 20 and 80% of the weight of the transfer layer and Very good results are achieved with an amount of inorganic ller equal to between 45 and 50% of the weight of the transfer layer.

The plasticizer may be present in the transfer layer, for instance, in an amount equalto between and 70% of the weight of'the transfer layer andv very good results are achieved with an amount of plasticizer equal to between 12 and 18% of the weight of the transfer layer.

The secondary plasticizer may be present in the transfer layer, for instance, in an amount equal to between 5 and 70% of the weight of the transfer layer and very good results are achieved with an amount of secondary plasticizer equal to between 12 and 18% of the weight of the transfer layer.

When it is desired to transfer portions of the transfer layer so as to obtain copies in brown color, then the gamma-Fe203 magnet pigment may sufiice or an additional brown pigment may beadded. In any event, the magnetic or magnetizable material will not only serve for its magnetic or electric properties but also to take over fully or at least in part the function of the inorganic filler material and of the colored pigment.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

FIG. 1 (comprising FIGS. la, 1b and 1c) is adiagrammatic, cross sectional illustration of the transfer of copy with copy sheets according to one embodiment of the present invention;

FIG. 2 (comprising FIGS. 2a and 2b) is a diagrammatic, cross sectional illustration of the transfer of copy using copy sheets in accordance with another embodiment of the present invention;

FIG. 3 is an enlargedview looking down at a portion -of a transfer layer in accordance with the present invention;

FIG. 4 (comprising FIGS. 4a and 4b) is a cross sectional illustration of the transfer of copy with copy sheets according to another embodiment of the present invention; and

FIG. 5 is a schematic cross sectional view of a transfer sheet according to the present invention which includes a protective layer covering the free face of the transfer layer.

Referring more particularly to the drawings, and particularly to FIG. 1, a copy paper sheet 1, 2 comprising a carrier sheet 1 and a transfer layer 2 is placed adjacent a copy paper sheet 1', 3 comprising a carrier sheet 1 and a take-up layer 3 against a supporting surface 6 which corresponds to the roller of a typewriter. When the typewriter key 5 strikes against the carrier sheet 1, 2 the transfer layer -2 comes in contact with the take-up layer 3 and firmly adheres thereto so as to form the corresponding impression on the copy sheet 1, 3.

FIG. 2 illustrates the making of copy with three copy sheets in accordance with the present invention. The copy sheet 1, 2 comprising a carrier sheet 1 and a transfer layer 2 is placed adjacenta copy sheet 1', 2', 3, comprising a carrier sheet 1 having on one face thereof a take-up layer 3 and on the other face thereof a transfer layer 2', this sheet 1', 2', 3 being placed between sheet 1, 2 and a copy sheet 1", 3" comprising a carrier sheet 1" and a take-up layer 3". This assembly of three sheets is placed against a typewriter roller 6 and when this typewriter keys 7 and 8 strike the rst sheet the corresponding image from the transfer layer 2 adheres to the take-up layer 3 of the intermediate copy sheet 1', 2', 3, and the same image 2 is transferred therefrom to the carrier-sheet 1", 3 where it adheres to the take-up layer 3".

FIG. 3 illustrates that bodies of transfer layer 9 are separated by canals 10 so that the bodies are much like islands. Of course this illustration is greatly enlarged. The effect of the fact that the transfer layer is in the form shown is that the transfer of the image from the transfer layer to a take-up layer is greatly facilitated.

Referring now to FIGS. 4a and 4b of the drawing, the copy sheet 1, 2, 3, comprises a carrier sheet 1, a transfer layer 2, and a -take-up layer 3 arranged in the indicated sequence. A sheet on which copy is to be produced, for instance plain sheet 1 is interposed between roller 6 of the typewriter and a copy sheet 1, 2, 3. When typewriter key 5 strikes carrier sheet 1, an image corresponding to the impressed portion of typewriter key 5 will be formed on the free face of carrier sheet 1. Corresponding portions of transfer layer 2 and take-up layer 3 will be transferred to the adjacent face of plain sheet 1' and will form thereon an image consisting, as illustrated in FIG. 4b, of

a portion of transfer layer 2 and of take-up layers 3, the latter being in-terposed between plain sheet 1' and the transferred portion of transfer layer 2.

It is rof course also possible to replace plain sheet 1 with one or more copy sheets 1, 2, 3 so that the free face of the respective carrier sheet is adjacent to -the take-up layer of the superposed copy sheet.

FIG. 5 illustrates the embodiment of the present invention according to which a protective pigment containing layer 7 is superposed upon transfer layer 2 carried by carrier sheet 1.

Y The following examples are given as illustrative only, without, however, limiting the invention to the specific details of the examples.

EXAMPLE I The resulting composition was then applied to a carrier sheet of paper and dried.

A take-up layer suitable for use with the foregoing transfer layer can be made, for example, of 70% by weight of polyethylene, 20% by weight of stearic acid and 10% by weight of parafn wax.

EXAMPLE II A transfer layer was prepared by thoroughly mixing together 50 parts by weight of a 25% by weight solution of tannic acid in 74 O.P. methylated spirits and a paste formed by grinding together four times in a three-roller mill the following constituents:

Parts by weight Peerless carbon black 1.70 Cellosolve (ethylene glycol monoethyl ether) 11.95 Magnetic pigment LK 15.00 Titanium white 18.15

China clay 15.30 Dibutyl phthalate 11.45 Castor oil 11.45

The resulting mixture was then cast on a paper sheet Vso as to form thereon a coating having a dry weight of between 5 and 6 grams per square meter.

A take-up layer suitable for use with the above transfer layer may consist, for instance, of 40% by weight of low melting polyethylene, 56% by weight of paraflin wax and 4% by weight of zinc oxide.

In the following examples, the composition of pastes is described which may be mixed with tannic acid solutions in accordance with Examples I and II to form transfer layers according to the present invention.

EXAMPLE III Parts by weight Carbon black Peer-less 155 1.00 Cellosolve 12.00 Magnetic pigment type ZM (Bayer) 18.20 Titanium white 18.15

Kaolin 12.80

Parts by weight Dio ctylsebacate 1 1.40 Ricinoleic acid 11.45

EXAMPLE IV Parts by weight Carbon black Peerless 1.70

Cellosolve 12.00 Magnetic pigment type S-l2l (Bayer) 14.60 Titanium white 19.60

Kaolin 14.25 Tricresylphosphate 13.15 Castor oil 9.80

EXAMPLE V Y Parts by Weight Cellosolve 13.00 Magnetic pigment type LK (BASF) 46.80 Dibutylphthalate 12:60 Cast-or oil 12.60

EXAMPLE VI Parts by weight Carbon black Peerless 155 2.10

Cellosolve 11.80 Magnetic pigment type S-12 47.00 Dibutylstearate 11.30 Castor oil 12.80

Magnetic pigment types LK and ZM consist of magnetite (Fe304), and type S-12 consists of gamma-FeZOa. The take-up layer to be used in connection with the transfer layers formed of the pastes of Examples III-VI and tannic acid solution may be one of those described herein in Examples I and II, or, for instance, one of those described in my copending application Serial No.`

Without further analysis, the foregoing will so fully reveal the Vgist of the present invention that others can, by applying current knowledge .readily adapt it for variout applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of an effective amount of at least one plasticizer for lsaid tannic acid selected from the group consisting of dibutylphthalate, dioctylphthalate, diamylphthalate, tricresylphosphate, cyclohexyl-p-toluene-sulfonamide, dioctylsebacate, dibutylstearate and tributylphosphate, of at least one solid inorganic colloidal'ller material selected from the group consisting of bentonite, kaolin, calcium carbonate, calcium sulphate, calci-um phosphate and zinc oxide in Van amount of L15-1.70 times the weight of said tannic acid plus said plasticizer, and of a coloring pigment whereby upon the mak-ing of an impression on the opposite face of said carrier sheet when said one face thereof is in contact with a face of a takeup sheet sensitive to and adapted to receive said transfer layer a portion of said transfer layer corresponding to said irnpression is transferred to and ad-heres to said take-up sheet, thereby making a copy of said impression there- 2. A copy paper or the like, comprising a c ,aarggier sheet .provided on one face there-of with a transfer layer consisting essentially of tannic acid, of an effective amount of at least one plasticizer for said tannic acid selected from the group consisting of dibutylp-hthalate, dioctylphthalate, diaimylphthalate, tricresylphosphate, cycloheXyl p toluenesulfonam-ide, di-octylsebacate, dibutylstearate and tributylphosphate, of at least one solid inorganic colloidal ller material selected from the group consisting of bentonite, kaolin, calcium carbonate, calcium sulphate, calcium phosphate and zinc oxide in an amount of 1.15-1.70 times the weight of said tannic acid plus said plasticizer, and of a coloring pigment and lprovided on the other face thereof with a take-up layer sensitive to and adapted to receive impressions of said -transfer layer, said take-up layer consisting essentially of a dried resinous substance selected from the group consisting of vinyl polymers, ethyl cellulose, benzyl cellulose, methyl cellulose, carboxymethyl cellulose, polydiolenes, dioleiine-styrene mixed polymers, polycarbonates, colophonium, copal, abietic-maleic resins and cumarone resins, and of an effective amount of at least one plasticizer in which said resinous substance is soluble, whereby said transfer layer is adapted to transfer impressions to said take-up layer.

3. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of at least one plasticizer for said tannic acid in an amount equal to between about 0.5 and 3 times the weight of said tannic acid, said plasticizer being selected from the group consisting of dibutylphthalate, dioctylphthalate, dia-mylphthalate, tricresylphosphate, cycloheXyl-p-toluene sulfonamide, dioctylsebacate, dibutylstearate and tributylphosphate, of at least one solid non-magnetic inorganic colloidal ller material selected from the group consisting of bentonite,

kaolin, calcium carbonate, calcium sulfate, calcium phosphate, and zinc oxide in an amount of 1.15-1.70 times the weight of said tannic acid plus said plasticizer, and of a coloring pigment, whereby upon the making of an impression on the opposite face of said carrier sheet when said one face thereof is in contact with a face of a take-up sheet sensitive to and adapted to receive said transfer layer a portion of said transfer layer corresponding to said impression is transferredv to and adheres to said take-up sheet, thereby making a copy of said impression thereon.

4. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of at least one plasticizer for said tannic acid in an amount equal to between about 0.5 and 3 times the weight of said tannic acid, said plasticizer being selected from the group consisting of dibutylphthalate, dioctylphthalate, diamylphthalate, tricresylphosphate, cycloheXyl-p-toluene-sulfonamide, dioctylsebacate, dibutylstearate and tributylphosphate, of at least one solid magnetic inorganic -colloidal filler material selected from the group consisting of Fe304, gamma- Fe203 free of cobalt, cobalt-containing gamma-Fe203 and iron in an amount of 1.15-1.70 times the weight of said tannic acid plus said plasticizer, whereby upon the making of an impression on the opposite face of said carrier sheet when said one face thereof is in contact with a face of a takemp sheet sensitive to and adapted to receive said transfer layer a portion of said transfer layer corresponding to said impression is transferred to and adheres to said takealp sheet, thereby making a copy of said impression thereon.

5. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of at least one plasticizer for said tannic acid in an amount equal to between about 0.5 and 3 times the weight of said tannic racid, said plasticizer being selected from the group con- .sisting of dibutylphthalate, dioctylphthalate, diamylphthal- .-ate, tricresylphosphate, cyclohexyl-ptoluene-sulfonamide, dioctylsebacate, dibutylstearate and tributylphosphate, yand of inorganic colloidal ller material comprising nonvmagnetic material selected from the group consisting of bentonite, kaolin, calcium carbonate, calcium sulphate, -calcium phosphate and zinc oxide and magnetic material selected from the `group consisting of Fe304, gamma Fe203 free of cobalt, cobalt-containing gamma Fe203 .and iron in a combined amount of 1.15 to 1.70 times the weight of said tannic acid plus said plasticizer, and of a coloring pigment, whereby upon the making of an impression on the opposite face of said carrier sheet when said one face thereof is in contact with a face of a take-up sheet sensitive to and adapted to receive said transfer layer a portion of said transfer layer corresponding to said impression is transferred to and adheres to said take-up sheet, thereby making a copy of said impression thereon.

6. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of an elfective amount of at least one primary non-volatile plasticizer for said tannic acid in which said tannic acid is soluble in an amount equal to between about 0.5 and 3 times the weight of said tannic acid, said plasticizer being selected from the group consisting of dibutylphthalate, dioctylphthalate, diamylph'thalate, tricresylphosphate, cyclohexyl-p-toluenesulfonamide, dioctylsebacate, dibutylstearate and tributylphosphate, of at least one solid inorganic colloidal filler material selected from the group consisting of bentonite, kaolin, calcium carbonate, calcium sulphate, calcium phosphate and zinc oxide in an amount of 1.15-1.70 times the weight of said tannic acid plus said plasticizer, of a coloring pigment and a secondary plasticizer in which said tannic acid is insoluble in an amount equal to between about 0.5 and 3 times the weight of said tannic acid, and selected from the group consisting of castor oil and ricinoleic acid whereby upon the making of an impression on the opposite face of said carrier sheet when said one face thereof is in contact withl a face of a take-up sheet sensitive to and adapted to receive said transfer layer a portion of said transfer layer corresponding to said impression is transferred to and adheres to said take-up sheet, thereby making a copy of said impression thereon.

7. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tanic acid, of at least one plasticizer for said tannic acid in an amount equal to between about 0.5 and 3 times the weight of said tannic acid, said plasticizer being selected from the group consisting of dibutylphthalate, dioctylphthalate, diamylphthal ate, tricresylphosphate, cycloheXyl-p-toluene-slufonamide, dioctylsebacate, dibutylstearate and tributylphosphate, of at least one solid magnetic inorganic colloidal ller material selected from the group consisting of Fe304, gamma Fe203 free of cobalt, cobalt-containing gamma 1:"e304I and iron in an amount equal to between l0 and 75% by weight of the dry weight of said transfer layer, whereby upon the making of an impression on the opposite face of said carrier sheet when said one face thereof is in contact with a face of a take-up sheet sensitive to and adapted to receive said transfer layer a portion of said transfer layer corresponding to said impression is transferred to and adheres to said take-up sheet, thereby making a copy of said impression thereon.

8. A copy paper or the like, comprising a carrier sheet provided on one face thereof with a transfer layer consisting essentially of tannic acid, of an effective amount of at least one primary non-volatile plasticizer for said tannic acid in which said tannic acid is soluble in an amount equal to between about 0.5 and 3 times the weight of said tannic acid, said plasticizer being selected from the group consisting of dibutylphthalate, dioctylphthalate, diamylphthalate, tricresylphosphate, cyclohexyl-ptoluene-sulfonamide, dioctylsebacate, dibutylstearate and tributylphosphate, of at least one solid inorganic colloidal ller material selected-from the group consisting of bentonite, kaolin, calcium carbonate, calcium sulphate, calcium phosphate and zinc oxide in an amount of 1.15- 1.70 times the weight of said tannic acid plus said plasticizer, and a secondary plasticizer in which said tannic acid is insoluble in an amount equal to between 0.5 and 3 times the weight of said tannic acid, said secondary 9 10 plasticizer being selected from the group consisting of References Cited by the Examiner `castor oil and ricinoleic acid whereby upon the making UNITED STATES PATENTS of an impression on the opposite face of said carrier sheet when said one face thereof is in contact with a 'l/1959 Newman et al' 117-362 XR face of a take-up sheet sensitive to and adapted to receive 5 306145 1 /1959 Newman et al' 11,736'4 said transfer layer a portion of said transfer layer corre- 4 0/1962 Graf et al' 117-36'1 sponding to said impression is transferred to and adheres to said take-up sheet, vthereby making a copy of said MURRAY KATZPHmary Exammer' impression thereon. WILLIAM D. MARTIN, Examiner. 

1. A COPY PAPER OR THE LIKE, COMPRISING A CARRIER SHEET PROVIDED ON ONE FACE THEREOF WITH A TRANSFER LAYER CONSISTING ESSENTIALLY OF TANNIC ACID, OF AN EFFECTIVE AMOUNT OF AT LEAST ONE PLATICIZER FOR SAID TANNIC ACID SELECTED FROM THE GROUP CONSISTING OF DIBUTYLPHATHALATE, DIOCTYLPHATHALATE,DIAMYLPHTHALATE, TRICRESYLPHOSPHATE, CYCLOHEXYL-P-TOLUENE-SULFONAMIDE, DIOCTYLSEBACATE, DIBUTYLSTEARATE AND TRIBUTYLPHOSPHATE, OF AT LEAT ONE SOLID INORGANIC COLLOIDAL FILLER MATERIAL SELECTED FROM THE GROUP CONSISTING OF BENTONITE, KAOLINE, CALCIUM CARBONATE, CALCIUM SULPHATE, CALCIUM PHOSPHATE AND ZINC OXIDE IN AN AMOUNT OF 1.15-1.70 TIMES THE WEIGHT OF SAID TANNIC ACID PLUS SAID PLASTICIZER, AND OF A COLORING PIGMENT WHEREBY UPON THE MAKING OF AN IMPRESSION ON THE OPPOSITE FACE OF SAID CARRIER SHEET WHEN SAID ONE FACE THEREOF IS IN CONTACT WITH A FACE OF A TAKEUP SHEET SENSITIVE TO AND ADAPTED TO RECEIVE SAID TRANSFER LAYER A PORTION OF SAID TRANSFER LAYER CORRESPONDING TO SAID IMPRESSIONIS TRANSFERRED TO AND ADHERES TO SAID TAKE-UP SHEET, THEREBY MAKING A COPY OF SAID IMPRESSION THEREON. 